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    <title>Reprojection with EPSG.io Search</title>
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          <h4 id="title">Reprojection with EPSG.io Search</h4>
          <div id="map" class="map"></div>
<form class="form-inline">
  <label for="epsg-query">Search projection:</label>
  <input type="text" id="epsg-query" placeholder="4326, 27700, US National Atlas, Swiss, France, ..." class="form-control" size="50" />
  <button id="epsg-search" class="btn">Search</button>
  <span id="epsg-result"></span>
  <div>
    <label for="render-edges">
      Render reprojection edges
      <input type="checkbox" id="render-edges">
    </label>
  </div>
</form>

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          <p id="shortdesc">Demonstrates client-side raster reprojection of OSM to arbitrary projection</p>
          <div id="docs"><p>This example shows client-side raster reprojection capabilities from OSM (EPSG:3857) to arbitrary projection by searching in <a href="https://epsg.io/">EPSG.io</a> database.</p>
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          <div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.extent.html" title="API documentation for ol.extent">ol.extent</a></li>,<li><a href="../apidoc/ol.layer.Tile.html" title="API documentation for ol.layer.Tile">ol.layer.Tile</a></li>,<li><a href="../apidoc/ol.proj.html" title="API documentation for ol.proj">ol.proj</a></li>,<li><a href="../apidoc/ol.source.OSM.html" title="API documentation for ol.source.OSM">ol.source.OSM</a></li>,<li><a href="../apidoc/ol.source.TileImage.html" title="API documentation for ol.source.TileImage">ol.source.TileImage</a></li></ul></div>
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        <form method="POST" id="codepen-form" target="_blank" action="https://codepen.io/pen/define/">
          <textarea class="hidden" name="title">Reprojection with EPSG.io Search</textarea>
          <textarea class="hidden" name="description">Demonstrates client-side raster reprojection of OSM to arbitrary projection</textarea>
          <textarea class="hidden" name="js">var map &#x3D; new ol.Map({
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM()
    })
  ],
  target: &#x27;map&#x27;,
  view: new ol.View({
    projection: &#x27;EPSG:3857&#x27;,
    center: [0, 0],
    zoom: 1
  })
});


var queryInput &#x3D; document.getElementById(&#x27;epsg-query&#x27;);
var searchButton &#x3D; document.getElementById(&#x27;epsg-search&#x27;);
var resultSpan &#x3D; document.getElementById(&#x27;epsg-result&#x27;);
var renderEdgesCheckbox &#x3D; document.getElementById(&#x27;render-edges&#x27;);

function setProjection(code, name, proj4def, bbox) {
  if (code &#x3D;&#x3D;&#x3D; null || name &#x3D;&#x3D;&#x3D; null || proj4def &#x3D;&#x3D;&#x3D; null || bbox &#x3D;&#x3D;&#x3D; null) {
    resultSpan.innerHTML &#x3D; &#x27;Nothing usable found, using EPSG:3857...&#x27;;
    map.setView(new ol.View({
      projection: &#x27;EPSG:3857&#x27;,
      center: [0, 0],
      zoom: 1
    }));
    return;
  }

  resultSpan.innerHTML &#x3D; &#x27;(&#x27; + code + &#x27;) &#x27; + name;

  var newProjCode &#x3D; &#x27;EPSG:&#x27; + code;
  proj4.defs(newProjCode, proj4def);
  var newProj &#x3D; ol.proj.get(newProjCode);
  var fromLonLat &#x3D; ol.proj.getTransform(&#x27;EPSG:4326&#x27;, newProj);

  // very approximate calculation of projection extent
  var extent &#x3D; ol.extent.applyTransform(
      [bbox[1], bbox[2], bbox[3], bbox[0]], fromLonLat);
  newProj.setExtent(extent);
  var newView &#x3D; new ol.View({
    projection: newProj
  });
  map.setView(newView);
  newView.fit(extent);
}


function search(query) {
  resultSpan.innerHTML &#x3D; &#x27;Searching ...&#x27;;
  fetch(&#x27;https://epsg.io/?format&#x3D;json&amp;q&#x3D;&#x27; + query).then(function(response) {
    return response.json();
  }).then(function(json) {
    var results &#x3D; json[&#x27;results&#x27;];
    if (results &amp;&amp; results.length &gt; 0) {
      for (var i &#x3D; 0, ii &#x3D; results.length; i &lt; ii; i++) {
        var result &#x3D; results[i];
        if (result) {
          var code &#x3D; result[&#x27;code&#x27;], name &#x3D; result[&#x27;name&#x27;],
              proj4def &#x3D; result[&#x27;proj4&#x27;], bbox &#x3D; result[&#x27;bbox&#x27;];
          if (code &amp;&amp; code.length &gt; 0 &amp;&amp; proj4def &amp;&amp; proj4def.length &gt; 0 &amp;&amp;
              bbox &amp;&amp; bbox.length &#x3D;&#x3D; 4) {
            setProjection(code, name, proj4def, bbox);
            return;
          }
        }
      }
    }
    setProjection(null, null, null, null);
  });
}


/**
 * Handle click event.
 * @param {Event} event The event.
 */
searchButton.onclick &#x3D; function(event) {
  search(queryInput.value);
  event.preventDefault();
};


/**
 * Handle change event.
 */
renderEdgesCheckbox.onchange &#x3D; function() {
  map.getLayers().forEach(function(layer) {
    if (layer instanceof ol.layer.Tile) {
      var source &#x3D; layer.getSource();
      if (source instanceof ol.source.TileImage) {
        source.setRenderReprojectionEdges(renderEdgesCheckbox.checked);
      }
    }
  });
};
</textarea>
          <textarea class="hidden" name="css"></textarea>
          <textarea class="hidden" name="html">&lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
&lt;form class&#x3D;&quot;form-inline&quot;&gt;
  &lt;label for&#x3D;&quot;epsg-query&quot;&gt;Search projection:&lt;/label&gt;
  &lt;input type&#x3D;&quot;text&quot; id&#x3D;&quot;epsg-query&quot; placeholder&#x3D;&quot;4326, 27700, US National Atlas, Swiss, France, ...&quot; class&#x3D;&quot;form-control&quot; size&#x3D;&quot;50&quot; /&gt;
  &lt;button id&#x3D;&quot;epsg-search&quot; class&#x3D;&quot;btn&quot;&gt;Search&lt;/button&gt;
  &lt;span id&#x3D;&quot;epsg-result&quot;&gt;&lt;/span&gt;
  &lt;div&gt;
    &lt;label for&#x3D;&quot;render-edges&quot;&gt;
      Render reprojection edges
      &lt;input type&#x3D;&quot;checkbox&quot; id&#x3D;&quot;render-edges&quot;&gt;
    &lt;/label&gt;
  &lt;/div&gt;
&lt;/form&gt;
</textarea>
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          <input type="hidden" name="data">
        </form>
        <pre><code id="example-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html&gt;
  &lt;head&gt;
    &lt;title&gt;Reprojection with EPSG.io Search&lt;/title&gt;
    &lt;link rel="stylesheet" href="https://openlayers.org/en/v4.6.5/css/ol.css" type="text/css"&gt;
    &lt;!-- The line below is only needed for old environments like Internet Explorer and Android 4.x --&gt;
    &lt;script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"&gt;&lt;/script&gt;
    &lt;script src="https://openlayers.org/en/v4.6.5/build/ol.js"&gt;&lt;/script&gt;
    &lt;script src&#x3D;&quot;https://cdnjs.cloudflare.com/ajax/libs/proj4js/2.4.4/proj4.js&quot;&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;form class&#x3D;&quot;form-inline&quot;&gt;
      &lt;label for&#x3D;&quot;epsg-query&quot;&gt;Search projection:&lt;/label&gt;
      &lt;input type&#x3D;&quot;text&quot; id&#x3D;&quot;epsg-query&quot; placeholder&#x3D;&quot;4326, 27700, US National Atlas, Swiss, France, ...&quot; class&#x3D;&quot;form-control&quot; size&#x3D;&quot;50&quot; /&gt;
      &lt;button id&#x3D;&quot;epsg-search&quot; class&#x3D;&quot;btn&quot;&gt;Search&lt;/button&gt;
      &lt;span id&#x3D;&quot;epsg-result&quot;&gt;&lt;/span&gt;
      &lt;div&gt;
        &lt;label for&#x3D;&quot;render-edges&quot;&gt;
          Render reprojection edges
          &lt;input type&#x3D;&quot;checkbox&quot; id&#x3D;&quot;render-edges&quot;&gt;
        &lt;/label&gt;
      &lt;/div&gt;
    &lt;/form&gt;
    &lt;script&gt;
      var map &#x3D; new ol.Map({
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM()
          })
        ],
        target: &#x27;map&#x27;,
        view: new ol.View({
          projection: &#x27;EPSG:3857&#x27;,
          center: [0, 0],
          zoom: 1
        })
      });


      var queryInput &#x3D; document.getElementById(&#x27;epsg-query&#x27;);
      var searchButton &#x3D; document.getElementById(&#x27;epsg-search&#x27;);
      var resultSpan &#x3D; document.getElementById(&#x27;epsg-result&#x27;);
      var renderEdgesCheckbox &#x3D; document.getElementById(&#x27;render-edges&#x27;);

      function setProjection(code, name, proj4def, bbox) {
        if (code &#x3D;&#x3D;&#x3D; null || name &#x3D;&#x3D;&#x3D; null || proj4def &#x3D;&#x3D;&#x3D; null || bbox &#x3D;&#x3D;&#x3D; null) {
          resultSpan.innerHTML &#x3D; &#x27;Nothing usable found, using EPSG:3857...&#x27;;
          map.setView(new ol.View({
            projection: &#x27;EPSG:3857&#x27;,
            center: [0, 0],
            zoom: 1
          }));
          return;
        }

        resultSpan.innerHTML &#x3D; &#x27;(&#x27; + code + &#x27;) &#x27; + name;

        var newProjCode &#x3D; &#x27;EPSG:&#x27; + code;
        proj4.defs(newProjCode, proj4def);
        var newProj &#x3D; ol.proj.get(newProjCode);
        var fromLonLat &#x3D; ol.proj.getTransform(&#x27;EPSG:4326&#x27;, newProj);

        // very approximate calculation of projection extent
        var extent &#x3D; ol.extent.applyTransform(
            [bbox[1], bbox[2], bbox[3], bbox[0]], fromLonLat);
        newProj.setExtent(extent);
        var newView &#x3D; new ol.View({
          projection: newProj
        });
        map.setView(newView);
        newView.fit(extent);
      }


      function search(query) {
        resultSpan.innerHTML &#x3D; &#x27;Searching ...&#x27;;
        fetch(&#x27;https://epsg.io/?format&#x3D;json&amp;q&#x3D;&#x27; + query).then(function(response) {
          return response.json();
        }).then(function(json) {
          var results &#x3D; json[&#x27;results&#x27;];
          if (results &amp;&amp; results.length &gt; 0) {
            for (var i &#x3D; 0, ii &#x3D; results.length; i &lt; ii; i++) {
              var result &#x3D; results[i];
              if (result) {
                var code &#x3D; result[&#x27;code&#x27;], name &#x3D; result[&#x27;name&#x27;],
                    proj4def &#x3D; result[&#x27;proj4&#x27;], bbox &#x3D; result[&#x27;bbox&#x27;];
                if (code &amp;&amp; code.length &gt; 0 &amp;&amp; proj4def &amp;&amp; proj4def.length &gt; 0 &amp;&amp;
                    bbox &amp;&amp; bbox.length &#x3D;&#x3D; 4) {
                  setProjection(code, name, proj4def, bbox);
                  return;
                }
              }
            }
          }
          setProjection(null, null, null, null);
        });
      }


      /**
       * Handle click event.
       * @param {Event} event The event.
       */
      searchButton.onclick &#x3D; function(event) {
        search(queryInput.value);
        event.preventDefault();
      };


      /**
       * Handle change event.
       */
      renderEdgesCheckbox.onchange &#x3D; function() {
        map.getLayers().forEach(function(layer) {
          if (layer instanceof ol.layer.Tile) {
            var source &#x3D; layer.getSource();
            if (source instanceof ol.source.TileImage) {
              source.setRenderReprojectionEdges(renderEdgesCheckbox.checked);
            }
          }
        });
      };
    &lt;/script&gt;
  &lt;/body&gt;
&lt;/html&gt;</code></pre>
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